Isaac joseph



(No Model.)

I; JOSEPH.

TNDTGATING MEGHANTSM TOR BAROMETERS 0R OTHER INSTRUMENTS. No. 389,967. o Patented Sept.` 25, 1888.

Isaac Jseph,

IINTTee STATES PATENT Orricso.

ISAAC JOSEPH, OF NO. G KENNING'ION PARK ROAD, COUNTY OF SURREY,

ENGLAND.

INDICATlNG MECHANlSll/I FOR BAROMETERS R OTHER INSTRUMENTS.

SPECIFICATION forming part of Letters Patent No. 389,967, dated September 25, 1888.

Application filed October 24, 1887. Serial No. 253,383.

T0 all whom it may concern:

Be it known that I, Isaac JosErH, manufacturing optician, a subject of the Queen of Great Britain, and residing at No. 6 Keunington Park Road, in the county of Surrey, England,

have invented certain new and useful Improvements in Registering and Recording Mechanisms for Barometers or Similar Meteorological or other Instruments, (for which I have 10 obtained a patent in Great Britain, No. 1,324,

bearing date January 27, 1887,) ol' which the following is a specification.

My invention relates to the construction of an improved indicating mechanism for barometers or similar meteorological or other instruments.

It has hitherto been the practice to supplement the coarse scale of a pediment barometer, for instance, with a sliding finely-divided 2o Vernier, by means of which the divisions of fere with their legibility to the extent of making a close scrutiny necessary to distinguish adjoining marks.

According to my present invention I providea dial of as large a radius as is consistent 3o -with the general design of the instrument and mark upon it two arc-shaped scales of as large a radius as is practicable, and divide these scales with fine divisions representing as small subdivisions as fiftieths of an inch, which subdivisions are, as a consequence of the length of the arc-shaped scale as compared with that ot' the coarse scale, easily distinguishable. Upon each side of the tube I mark an ordinary coarse geometric scale. Either tine and coarse 4o scale is, respective] y,a counterpart of the other.

The readings of a coarse scale are transferred to the fine scale by means of a pair of indices mechanically connected, so that they both move in harmony. I also provide a series of indicating-dials, by means of which the maximum, minimum, or average reading for any term may be indicated upon the dial appropriated thereto, thereby producing a regular indication of preceding readings, from which (No model.)

dial.

Patented in England January 27, 1857, No. 1,324.

the general tendency of the phenomena under 5o observation may be ascertained by a comparison of the several readings of all the terms indicated,

I att-ain the objects of my invention by means of the mechanism represented in the accompanying figures, which illustrate the application of my invention to a barometer, which I have chosen as avsubject for illustration because of its being so familiar an instrument.

' Figure 1 is an elevation of a barometer to 6o which my invention has been applied. Fig. 2 is a detail,to a larger scale,of an indicating- Fig. 3 is a side elevation, and Fig. i a front elevation, illustrating the mechanical connection between the indices of a coarse and 6 5 a ine scale and the method of adjusting them. A is the case, and c the tube, both of them of any suitable construction or design.

C is the indicating-dial; c c', the two arcshaped scales, one a counterpart ofthe other,

and both struck from the center of the dial with as long a radius as is practicable, with which are combined two weather-charts, one, d, for winter, and the other, d for summer.

Each chart is divided and each division is provided with a description of the kind of weather which may be expected to accompany the baroinetrie pressure corresponding with said division. The two indices c c for the respective scales c c are pivoted behind the Se tube c to the center of the dial C on a common axis, about which they can be moved independently of each other. The two coarse scalesff are on opposite sides of the tube,and

preferably meet behind it. These scales are geometric-that is, an inch is actually an inch, while the arc representing the inch twentynine inches to thirty inches, on either c or c', is necessarilylonger than the arc representing the inch twenty-eight inches to twenty-nine 9o inches. 'Ihe reason ol' this difference will be explained farther on. As a result of the barometer-dial being marked with a short coarse vertical scale near the center of the dial,and an indication of the day to which it refers close to it, the reading of this scale can be taken by any one passing the instrument without it being necessary for him to observe it minutely,

L'. cease? while at the same time, if he desires to have the reading to a iiftieth of an inch, he can obtain it from the line scale by merely adjusting the index of the coarse scale.

The indices g g for the scales ff are respectivel y fast upon two racks, 71., which can he moved up and down in guides, formed in the case of the instrument by means of pinions i, respectively engaging therewith. The arbors ol' th se pinions' revolve in suitable bearings, and the front end of each one terminates in a squaref, adapted to receive an ad]- ustingkey through a hole, i", in the case of the inf strument.

The racks have each one a loop,jj, formed upon it,which loops project through slots 7c k', cut in the dial C, and respectively embrace the indices cc. The consequence of this mechanical connection between the index of a coarse scale and that of its corresponding finely-divided scale is that as the index, say g, of a coarse scale is adjusted according to the rise or fall of the mercury, the index c of the corresponding ilnely-dividcd scale will be moved accordingly, and mark exactly upon its fine scale the height of the mercury in the tube; but as the index c must travel through a longer are to move from twenty-nine inches to thirty inches than from twenty-eight inches to twentynine inches on thescale c the subdivisions ofthe former inch are proportionately larger than those ci' the latter.

Lisa plate with a series ol' semicircular openings, Z, eut in it. These are shown as ai ranged in a horizontal line, but they may be arranged as may be convenient. I have shown seven openings, because there are seven days in the week, but any other number may be used. lGach opening has a small index, t, depending 1`rom its top. 4-Echind each opening is an ixulicatingdia-l, m, divided with a scale comprehensive enough to embrace the maximum variations of the mercury. These dials arc independently movable upon their respective axes in the same way as before described with reference to a pinion,

Fig. ll shows scales c and f with their indices as appropriated to today, scales c and f with their indices to yesterday, and the seven indicating-dials, respectively,to Sunday, Monday, Tuesday, NVeduesday, Thursday, Friday, and Satnrdaywthat is, to last week, yesterday being Sunday and today Monday. Ifrequired, the readings o1' the seven indicatingdials Z may be entered in a book ruled for that purpose. On Monday night-that is, at the close of to-day-the reading of scale c will lbe transferred to the indieatingdial appropriated to Sunday, and that of scale c to scale c. The scales c and f can then be used for the next day, Tuesday. y

I do not confine myself to making the longer and minutely-divided scale of an areshape, although I wish to point out that this is the most convenient shape for an instrument with a dial-face. According to my invention the minutely-dividcd scale must be longer than the coarse scale; and it is evident that in some instruments this extra length can be secured without making the scale arc-shaped-c. y., it may be rectilinear and parallel with the coarse scale.

The connecting mechanism illustrated in the figures, and described therewith as making the two indices of a pair to move together, may be replaced by any other ol' equivalent effect.

In adapting my invention to instruments other than baromeiers the scales are modified accordingly, for the purpose oi' adapting them tothe special function ol" the particular instrument. Thus if it be desired to adapt my invention to a thermometer the geometrie scales close to the tube and marked f and f in Fig. 1 will be replaced by scales set out in degrees-Fahrenheit, eentigrade,or Reanniur, according tothe scale or scales adopted. The arc-shaped scales c c will be divided to correspend, and their divisions subdivided. The weather-charts (Z d will be dispensed with or replaced by others adapted to the indicating powers of the instrument as a tester and indi-m cator of varying temperatures.

Having fully described my invention, I declare that what I desire to claim as my invention, and to secure by Letters Patent, is-

1. The combination, on the face of a barometer or similar meteorological or other instrument, of a coarse scale close to the tube, a longer scale divided to correspond with the said coarse scale and minutcly subdivided,two indices appropriated, respectively, to the said coarse and minutcly-divided scales, one of which indices-viz., the one appropriated to the coarse scale-is iixed to a movable rack adapt-ed to be operated from the outside of the case, and also by means of a connection between it and the index appropriated te the minutely-divided scale to move the said index over the said scale and to make both indices point to .corresponding points on their respective scales at one time, and a series ol'` indicating-dials adapted to indicate the reading registered by the before-mentioned indices.

2. The combination, on the dial of a barometer, ol" a coarse scale divided geometrically and parallel with the tube, a longer and arcshaped scale divided to correspond with the said coarse scale and minutely subdivided, two indices appropriated, respectively, to the said coarse and nilinutely-divided scales, amechanical connection between the said two indices adapted to be operated from the outside of the case of the barometer and to make both indices point at one time to corresponding points on their respective scales, and a series of independeutly-operated indicating-dials divided to correspond with either the said coarse geometric or the finely divided arc-shaped scale and adapted to indicate their readings, substantially as hereinbefore described with reference to the accompanying drawings.

The combination of a pinion adapted to IOO he moved ab will on its axis@ rack with which In witness whereof I have hereunto set my said pinion engages, an index projecting from hand this 26th dey of August, 1887.

the end of said rack, a scale over which it can ISAAC JOSEPH. be moved by the rotation of said pinion, a Vtnesses:

5 pivoted index, and a loop upon seid rack WALTER J. SKERTEN,

adapted to embrace the Said pivoted index, 17 Gracechmch Street, London, E. C.. substantially as described with reference to G. F. W'ARREN,

the accompanying drawings. Notary Public, 17 Gmc'echurch Szfrcei, London. 

